The Vixen SDP65SS is a compact astrograph that delivers exceptional imaging quality at a more accessible price than the VSD telescope series. Designed specifically for astrophotography, this telescope features a four-element, four-group optical system incorporating both an SD (Super ED) lens and an ED (Extra-low Dispersion) lens. The result is outstanding image performance comparable to that of the VSD series. Thanks to its compact size and retractable dew cap, the telescope is an ideal travel companion for mobile astrophotographers.
Purpose-built for astrophotography
The SDP65SS has been purpose-built for astrophotography and features four elements made from SD glass, high-refractive-index ED glass and lanthanum glass. The arrangement of the lenses is optimised for maximum performance, significantly reducing axial chromatic aberration and achieving the same level of astigmatism correction as the VSD telescope series.
Exceptional image field flattening
The optimised arrangement of the four lenses made from SD and ED glass achieves an exceptionally flat image plane without the need for an additional flattening lens. It provides a high degree of correction and produces distortion-free star images across the entire 44 mm illuminated field of view.
Minimal vignetting
To reduce vignetting, the light beam is narrowed at the final lens element.
Thanks to the optical design, vignetting is virtually eliminated, ensuring excellent edge illumination with almost any camera system. Over 90% of the light is captured at the edge of a 35 mm full-frame sensor, reducing the need for extensive image processing afterwards.
Newly designed focuser
Focusing is achieved via a rack-and-pinion system that moves the lens assembly forwards and backwards. As the focuser body itself remains stationary, there is no tilting, even when using heavy accessories or cameras. A built-in vernier scale provides a clear reference for focus position, marked in 0.1 mm increments. For even greater precision, an optional dual-speed focuser or a third-party ZWO EAF (electronic focuser) can be attached.
Compact and lightweight
Measuring approximately 413 mm in length, or 359 mm with the dew cap retracted, the telescope is exceptionally portable—perfect for travel and field use.
Optional reducer availableWith the optional SDP Focal Reducer 0.8x, the SDP65SS can capture images with a wider field of view and shorter exposure times. The focal length is reduced by a factor of 0.8, and the focal ratio decreases from f/5.5 to f/4.4.
FEATURES- Lens design: 4-group 4-element SD (Super ED) apochromat, multi-coated
- Aperture: 65 mm
- Focal length: 360 mm (F5.5)
- Resolving power: 1.78 arc seconds
- Limiting magnitude: 10.8
- Light-gathering power: 86x
- Illumination: 44 mm to over 90% in the image corners
- Tube length / diameter: 413 mm (359 mm dew cap retracted) / 90 mm
- Eyepiece focuser: Internal focusing, rack-and-pinion with scale
- Adapter thread: 60 mm (P=0.75 mm), 42 mm for T-ring
- Visual back: 31.7 mm connection
- Solar observation: For solar observation, a solar projection screen set B and an eyepiece are required (not included)
- Weight: 2.6 kg
SCOPE OF DELIVERY- Vixen SDP65SS
- Dovetail slide bar
- 1/4 inch screws (L: 19 mm) x 2 pieces,
- Allen key (3 mm, 2 mm, 1.5 mm, 3/16 inch)
Products specifications
| Technical Data | | Colour: | white |
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| Material: | Aluminium |
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| Product family [Telescopes]: | Refracting telescope |
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| Field of application [telescopes]: | Deep-sky observation, deep-sky photography, lunar observation, lunar photography, planetary observation, planetary photography |
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| Target audience [Telescopes]: | Advanced users, specialists and researchers, visual observers |
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| Optical design: | Apochromatic refractor |
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| Mirror/lens diameter (mm): | 65 |
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| Focal length (mm): | 360 |
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| Maximum recommended magnification: | 130 |
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| ED Glas: | Ja |
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| Marking plate: | Nein |
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| Compass: | Nein |
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| Tube material: | Aluminium |
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| Portability: | very good |
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| Type of remuneration: | Multi-layer coating |
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| Tube diameter (mm): | 90 |
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| Height-adjustable tripod: | Nein |
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| Length with the tube retracted (approx., mm): | 359 |
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| Dust cover: | for the front lens and eyepiece socket |
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| Overall length (mm): | 413 |
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| Total width (mm): | 90 |
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| Net weight of optical tube (including accessories) (kg): | 2.6 |
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| Material of the front lens or corrective lens: | Ohara Japan FPL-53 ED Glas |
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| Opening ratio: | 5.5 |
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| Resolution (arc seconds): | 1.78 |
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| Visual stellar limiting magnitude (approx., mag): | 10.8 |
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